just for the hell of it, i busted out my stopwatch to time both the zl1 and z/28 from when they pass the filmer to when they exit the frame on that turn up ahead.
zl1 - 7.3 seconds
z/28 - 6.4 seconds
yeah... its fast. if you look close, you'll see that the z/28 also took that last turn much more aggressively.